code: def test_serialization(self):
      layer = layers.RNN(TwoStatesRNNCell(2), return_sequences=False)
      self.run_class_serialization_test(layer)
  
      layer = layers.RNN(OneStateRNNCell(2), return_sequences=False)
      self.run_class_serialization_test(layer)
  
imports: import numpy
  import pytest
  from keras import layers
  from keras import ops
  from keras import testing
label_desc: Use image node_id 12 for calling the RNNTest obj's underlying member method code with example usage: obj.test_serialization() without return types